# Stewart Butterfield: angel investments and portfolio

> Stewart Butterfield is an angel. 15 investments on record, 4 in the last 12 months, latest Oct 2026. Portfolio, stages, co-investors and team.

Source: https://millionrounds.com/fund/stewart-butterfield (Millionrounds; every figure on the page links to its filing or article)

[Investor](https://millionrounds.com/investors)

# Stewart Butterfield

Last cheque observed Oct 2026; 15 cheques on record.

Email

Angel Deploying now

Series A Seed Series B

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Deploying now

**100%** of best year **4** **cheques in 12 months**, 15 on record

Since the last cheque **29** days **00** hrs **00** min **00** sec

Median round **$35M** Rounds led **0 of 15** Exits **1 from the portfolio** Mostly in **United States, 62%**

Pitch Stewart Butterfield

## Stewart Butterfield highlights

- 01 4 cheques in the last 12 months
- 02 Mostly Series A and Seed: 73% of its rounds
- 03 1 exits from the portfolio

## What they do

- **Type:** Angel (from a list, unverified)
- **Cheque size:** Not stated
- **Cold pitches:** Not stated

## The record

Every round we can evidence, newest first **15 appearances**

- **2026** 3 rounds
- **Oct** **[Gardens Interactive](https://millionrounds.com/company/gardens-interactive)** Series B · US · The SaaS News **$35M** With 10 others
- **Jul** **[Centralize](https://millionrounds.com/company/centralize)** Series A · US · Crunchbase News **$15M** With 7 others
- **May** **[Viktor](https://millionrounds.com/company/viktor)** Series A · PL · Ventureburn **$75M** With 10 others
- **2025** 2 rounds
- **Nov** **[Beside](https://millionrounds.com/company/beside)** Series A · Ventureburn **$32M** With 3 others
- **Jul** **[Lovable](https://millionrounds.com/company/lovable)** Series A · SE · Crunchbase News **$200M** With 9 others
- **2023** 1 round
- **Sept** **[Linear](https://millionrounds.com/company/linear)** Series B · US · Karri Saarinen **$35M** With 16 others
- **2015** 2 rounds
- **Aug** **[Cozy](https://millionrounds.com/company/cozy)** Venture · US **$3.4M** With 4 others
- **Apr** **[Thington](https://millionrounds.com/company/thington)** Seed · US **Undisclosed** With 7 others
- **2011** 4 rounds
- **Apr** Series A · techcrunch.com **$35M** With 3 others
- **Apr** **[99designs](https://millionrounds.com/company/99designs)** Series A · US **$35M** With 3 others
- **Mar** **[Bloom Studio](https://millionrounds.com/company/bloom-studio)** Seed · GB · networkeffect.allthingsd.com **Undisclosed** With 6 others
- **Mar** **[Summify](https://millionrounds.com/company/summify)** Seed · CA · techcrunch.com **Undisclosed** With 7 others
- **2009** 1 round
- **Jan** **[Rouxbe](https://millionrounds.com/company/rouxbe)** Series B · CA **$2.1M** With 1 other
- **2008** 1 round
- **Jan** **[Flowgram](https://millionrounds.com/company/flowgram)** Seed · US · silicontap.com **$1.3M** With 7 others
- **2006** 1 round
- **Nov** **[Etsy](https://millionrounds.com/company/etsy)** Series A · US · techconfidential.com **$1.0M** With 4 others

An announcement gives the size of the round, not the size of this investor's cheque: the only rounds that imply a cheque are those where they were the sole named investor.

## The team

We hold **1** person at this firm from the lists this database was built from: a weaker source than the filings, since a list does not say when a title ended. Login to see them.

## Exits from the portfolio

Companies it backed that were later bought or listed **1 in all**

**[Summify](https://millionrounds.com/company/summify)** Bought by [Twitter](https://millionrounds.com/fund/twitter) **Undisclosed** Jan 2012

An exit counts when it came after the firm's first round in the company. From historical deal records.

## The cheque

Series A Seed Series B

Median round joined **$35M** the round, not its cheque

Led 0 of 15 rounds **0%**

- **Sole investor:** Never alone
- **Last cheque:** Oct 2026
- **Exits:** 1 from the portfolio

Rounds by stage said on their site

- Series A *7*
- Seed *4*
- Series B *3*
- Venture *1*

Cheques by month Led Joined

Dec 2023 Nov 2026

Often in the room with

- [Accel](https://millionrounds.com/fund/accel) 7
- [Anthony Casalena](https://millionrounds.com/fund/anthony-casalena) 2
- [Cal Henderson](https://millionrounds.com/fund/cal-henderson) 2
- [Caterina Fake](https://millionrounds.com/fund/caterina-fake) 2
- [Guillermo Rauch](https://millionrounds.com/fund/guillermo-rauch) 2
- [Index Ventures](https://millionrounds.com/fund/index-ventures) 2

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## Who they invest alongside

The investors most often in the same rounds as Stewart Butterfield. A count of rooms they were both in, not a relationship either has claimed.

[**Accel** VC firm **7** rounds together](https://millionrounds.com/fund/accel)[**Anthony Casalena** VC firm **2** rounds together](https://millionrounds.com/fund/anthony-casalena)[**Cal Henderson** Angel **2** rounds together](https://millionrounds.com/fund/cal-henderson)[**Caterina Fake** VC firm **2** rounds together](https://millionrounds.com/fund/caterina-fake)[**Guillermo Rauch** VC firm **2** rounds together](https://millionrounds.com/fund/guillermo-rauch)[**Index Ventures** VC firm **2** rounds together](https://millionrounds.com/fund/index-ventures)[**Joi Ito** Angel **2** rounds together](https://millionrounds.com/fund/joi-ito)[**Michael Dearing** Angel **2** rounds together](https://millionrounds.com/fund/michael-dearing)

## Recently backed

The latest companies Stewart Butterfield put money into.

[**Gardens Interactive** $35M · Oct 2026](https://millionrounds.com/company/gardens-interactive)[**Beside** $32M · Nov 2025](https://millionrounds.com/company/beside)[**Lovable** $200M · Jul 2025](https://millionrounds.com/company/lovable)

## On podcasts

6 episodes naming Stewart Butterfield in the title, and 4 more that mention it.

- [Invest Like the Best](https://millionrounds.com/podcasts/invest-like-the-best) 22 Jul 2021 · 1h 9m Stewart Butterfield - We Don’t Sell Saddles Here - [Founder’s Field Guide, EP. 43] Mentions [Stewart Butterfield](https://millionrounds.com/fund/stewart-butterfield) Apple PodcastsShow page
- [The Twenty Minute VC](https://millionrounds.com/podcasts/20vc) 16 Nov 2020 · 44 min 20VC: Slack Founder Stewart Butterfield on Leadership Styles, Decision-Making, The 3 Levels of Wealth, IPOs vs Direct Listings & Why Effective Entrepreneurship is Like Parkour Mentions [Stewart Butterfield](https://millionrounds.com/fund/stewart-butterfield)[Accel](https://millionrounds.com/fund/accel) Apple PodcastsShow page
- [The Official SaaStr Podcast](https://millionrounds.com/podcasts/saastr) 28 May 2020 · 25 min SaaStr 338: Slack CEO Stewart Butterfield on Taking Care of Your Team and Your Customers Mentions [Stewart Butterfield](https://millionrounds.com/fund/stewart-butterfield) Apple PodcastsShow page
- [How I Built This](https://millionrounds.com/podcasts/how-i-built-this) 9 May 2020 · 25 min How I Built Resilience: Live with Stewart Butterfield and Steve Holmes Mentions [Stewart Butterfield](https://millionrounds.com/fund/stewart-butterfield) Apple Podcasts
- [How I Built This](https://millionrounds.com/podcasts/how-i-built-this) 30 Jan 2020 · 18 min Live From The HIBT Summit: Stewart Butterfield Mentions [Stewart Butterfield](https://millionrounds.com/fund/stewart-butterfield) Apple Podcasts
- [Masters of Scale](https://millionrounds.com/podcasts/masters-of-scale) 26 Jul 2019 · 37 min The Big Pivot w/Slack's Stewart Butterfield Mentions [Stewart Butterfield](https://millionrounds.com/fund/stewart-butterfield) Apple Podcasts

### Mentioned in

- [In Depth](https://millionrounds.com/podcasts/in-depth) 28 Aug 2025 · 1h 6m From Chrome extension to $5B platform | Postman’s journey | Abhinav Asthana (Co-founder & CEO) Apple Podcasts
- [In Depth](https://millionrounds.com/podcasts/in-depth) 21 Mar 2024 · 59 min Essential lessons for building and scaling DevTools | Dennis Pilarinos (Unblocked, Apple, Amazon, Buddybuild, Microsoft) Apple Podcasts
- [In Depth](https://millionrounds.com/podcasts/in-depth) 25 Jan 2024 · 1h 5m The human side of world-class engineering leadership | Michael Lopp (Apple, Palantir, Slack) Apple Podcasts
- [Grit](https://millionrounds.com/podcasts/grit) 20 Nov 2023 · 1h 11m #165 Former CEO & Co-Founder of Zillow, Spencer Rascoff: Real Estate Voyeurism Apple PodcastsShow page

## Quick answers about Stewart Butterfield

### What does Stewart Butterfield invest in?

Stewart Butterfield invests most often at Series A and Seed (73% of the rounds on record).

### How active is Stewart Butterfield?

15 investments on record, 4 of them in the last 12 months. The most recent was in Oct 2026.

### What has Stewart Butterfield invested in recently?

Its most recent investments on record: Gardens Interactive (Series B, Oct 2026), Centralize (Series A, Jul 2026) and Viktor (Series A, May 2026).

### How big are Stewart Butterfield's cheques?

The median round it joins is $35M.

### Does Stewart Butterfield lead rounds?

Rarely, if at all: none of its 15 investments on record names it as the lead.

### Where does Stewart Butterfield invest?

Most of the companies it backs are in the United States (62%), Canada (15%) and Poland (8%).

### Is Stewart Butterfield investing now?

Yes: it is actively investing, with 4 investments in the last 12 months.

### Who does Stewart Butterfield invest alongside?

Most often Accel (7 rounds together), Anthony Casalena (2 rounds together) and Cal Henderson (2 rounds together).

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